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为了分析影响可调收扩喷管最优面积比的因素及其对最优面积比的影响程度,应用MATLAB软件对特定结构喷管的推力系数进行了最优值求解,得到了特定状态下喷管面积比的最优解(对应最大推力系数)。不同于传统的固定喷管,特定结构的可调喷管推力系数最大值并非对应完全膨胀状态,而是对应略微欠膨胀的状态。给出了使用这一优化结果的可调收扩喷管推力系数与使用1维等熵完全膨胀公式计算的推力系数的对比分析。结果表明:采用最优面积比的喷管具有更大的推力系数且对最优面积比影响较大的因素是可用落压比和喉道面积。
In order to analyze the factors influencing the optimum area ratio of adjustable nozzle and its influence on the optimal area ratio, MATLAB software was used to solve the optimal coefficient of the thrust coefficient of the nozzle with a specific structure. Tube area ratio of the optimal solution (corresponding to the maximum thrust coefficient). Different from the traditional fixed nozzles, the maximum value of the thrust coefficient of the adjustable nozzle of a specific structure does not correspond to the fully expanded state, but corresponds to a slightly undeveloped state. The comparison and analysis of the thrust coefficient of the adjustable nozzle and expansion nozzle using this optimization result and the thrust coefficient calculated by 1-D isentropic complete expansion formula are given. The results show that the nozzle with the optimal area ratio has a larger thrust coefficient and the factor that greatly affects the optimal area ratio is the available pressure ratio and throat area.